Transient photoconductivity and photo-excited carrier dynamics in (Bi1-xInx)2Se3 thin films

2020 ◽  
Author(s):  
Teng Shi ◽  
Kateryna Kushnir ◽  
Zhengtianye Wang ◽  
Stephanie Law ◽  
Lyubov V. Titova
Keyword(s):  
Thin Films ◽  
Carrier Dynamics ◽  
Transient Photoconductivity ◽  
Excited Carrier

scholarly journals Superior photo-carrier diffusion dynamics in organic-inorganic hybrid perovskites revealed by spatiotemporal conductivity imaging

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Xuejian Ma ◽  
Fei Zhang ◽  
Zhaodong Chu ◽  
Ji Hao ◽  
Xihan Chen ◽  
...  
Keyword(s):  
Thin Films ◽  
Solar Cell ◽  
Relaxation Times ◽  
Charge Trapping ◽  
Free Carrier ◽  
Carrier Dynamics ◽  
Electron Hole ◽  
Inorganic Hybrid ◽  
Diffusion Dynamics ◽  
The Difference

AbstractThe outstanding performance of organic-inorganic metal trihalide solar cells benefits from the exceptional photo-physical properties of both electrons and holes in the material. Here, we directly probe the free-carrier dynamics in Cs-doped FAPbI3 thin films by spatiotemporal photoconductivity imaging. Using charge transport layers to selectively quench one type of carriers, we show that the two relaxation times on the order of 1 μs and 10 μs correspond to the lifetimes of electrons and holes in FACsPbI3, respectively. Strikingly, the diffusion mapping indicates that the difference in electron/hole lifetimes is largely compensated by their disparate mobility. Consequently, the long diffusion lengths (3~5 μm) of both carriers are comparable to each other, a feature closely related to the unique charge trapping and de-trapping processes in hybrid trihalide perovskites. Our results unveil the origin of superior diffusion dynamics in this material, crucially important for solar-cell applications.

Ultrafast Carrier Dynamics in (Bi1-xInx)2Se3 Thin Films: From Topological to Band Insulator

2021 ◽  
Author(s):  
Kateryna Kushnir ◽  
Teng Shi ◽  
Zhengtianye Wang ◽  
Stephanie Law ◽  
Lyubov Titova
Keyword(s):  
Thin Films ◽  
Carrier Dynamics ◽  
Ultrafast Carrier Dynamics ◽  
Ultrafast Carrier ◽  
Band Insulator

scholarly journals Ultrafast Charge Carrier Dynamics in Vanadium-Modified TiO2 Thin Films and Its Relation to Their Photoelectrocatalytic Efficiency for Water Splitting

2020 ◽  
Vol 124 (49) ◽  
pp. 26572-26582
Author(s):  
Alberto Piccioni ◽  
Daniele Catone ◽  
Alessandra Paladini ◽  
Patrick O’Keeffe ◽  
Alex Boschi ◽  
...  
Keyword(s):  
Thin Films ◽  
Charge Carrier ◽  
Water Splitting ◽  
Carrier Dynamics ◽  
Tio2 Thin Films ◽  
Charge Carrier Dynamics
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